<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>计算器</title>
    <script src="js/vue.min.js"></script>
</head>
<body>
<div>
    <input type="text" v-model="n1">
    <input type="text" v-model="n2">
    <input type="button" value="加" @click="f(1)">
    <input type="button" value="减" @click="f(2)">
    <input type="button" value="乘" @click="f(3)">
    <input type="button" value="除" @click="f(4)">
    <h1>结果:{{result}}</h1>
</div>
<script>
    let v= new Vue({
        el:"body>div",
        data:{
            result:"",
            n1:"",
            n2:""
        },
        methods:{
            f(x){
                if (isNaN(v.n1)||isNaN(v.n2)){
                    v.result="输入错误"
                    return;
                }
                switch (x){
                    case 1:
                        v.result = v.n1*1 + v.n2*1;
                        break;
                    case 2:
                        v.result = v.n1- v.n2;
                        break;
                    case 3:
                        v.result = v.n1 * v.n2;
                        break;
                    case 4:
                        v.result = v.n1 / v.n2;
                        break;
                }
            },
        }
    })
</script>
</body>
</html>